Abstract: An electronic circuit for a micro-electro-mechanical systems gyroscope is disclosed. The electronic circuit includes a current buffer, a transimpedance amplifier coupled with the current buffer, and a plurality of transistors. An inverting input terminal of the current buffer and a non-inverting input terminal of the current buffer are connected with a plurality of first resistors. The inverting input terminal of the current buffer is connected with a source of one of the plurality of transistors, and the non-inverting input terminal of the current buffer is connected with a source of another one of the plurality of transistors. The plurality of first resistors are connected to a ground. The current buffer is configured to isolate a load in the micro-electro-mechanical systems gyroscope from the transimpedance amplifier.

Abstract: An aspect of the present disclosure concerns a calibration system including a test tone signal generator that produces a test tone; a transimpedance amplifier (TIA) that comprises two input terminals, receives two output signals from an external sensor device, the test tone, and a calibration signal at the two input terminals, and produces a voltage signal; and a calibration circuit that receives the voltage signal and the test tone to produce the calibration signal that causes the TIA to produce the voltage signal such that an error signal included in the voltage signal is canceled. The external sensor device may be a mode-matched vibratory micro-electro-mechanical systems (MEMS) gyroscope.

Abstract: An aspect of the present disclosure concerns an oscillator circuit including a driver circuit that includes a first amplifier and a current detector where the first amplifier produces an oscillation voltage signal, where the current detector detects an oscillation current signal and produces a drive voltage signal, and where the oscillation current signal corresponds to difference in voltage between the oscillation voltage signal and the drive voltage signal; a feedback circuit that includes a second amplifier receiving the oscillation voltage signal and the drive voltage signal, to produce a feedback voltage signal to the driver circuit; and an oscillator that oscillates at a frequency determined in accordance with the drive voltage signal.

Abstract: An auto phase control drive circuit for a gyroscope apparatus is disclosed. The gyroscope apparatus has a gyro resonator, and the circuit comprises a first circuit and a second circuit. The first circuit includes a first electrode configured to face the gyro resonator, a first amplifier configured to be electrically connected with the first electrode and output a first signal, a variable capacitor electrically connected with the first amplifier, a second electrode configured to face the gyro resonator, to receive a second signal and to be electrically connected with the variable capacitor. The second circuit is configured to be electrically connected with the first circuit and to change a capacitance of the variable capacitor of the first circuit based on the first signal and the second signal to decrease a phase difference between the first signal and the second signal.

Abstract: An aspect of the present disclosure concerns an oscillator circuit including a driver circuit that includes a first amplifier and a current detector where the first amplifier produces an oscillation voltage signal, where the current detector detects an oscillation current signal and produces a drive voltage signal, and where the oscillation current signal corresponds to difference in voltage between the oscillation voltage signal and the drive voltage signal; a feedback circuit that includes a second amplifier receiving the oscillation voltage signal and the drive voltage signal, to produce a feedback voltage signal to the driver circuit; and an oscillator that oscillates at a frequency determined in accordance with the drive voltage signal.

Abstract: An aspect of the present disclosure concerns a calibration system including a test tone signal generator that produces a test tone; a transimpedance amplifier (TIA) that comprises two input terminals, receives two output signals from an external sensor device, the test tone, and a calibration signal at the two input terminals, and produces a voltage signal; and a calibration circuit that receives the voltage signal and the test tone to produce the calibration signal that causes the TIA to produce the voltage signal such that an error signal included in the voltage signal is canceled. The external sensor device may be a mode-matched vibratory micro-electro-mechanical systems (MEMS) gyroscope.

Abstract: An auto phase control drive circuit for a gyroscope apparatus is disclosed. The gyroscope apparatus has a gyro resonator, and the circuit comprises a first circuit and a second circuit. The first circuit includes a first electrode configured to face the gyro resonator, a first amplifier configured to be electrically connected with the first electrode and output a first signal, a variable capacitor electrically connected with the first amplifier, a second electrode configured to face the gyro resonator, to receive a second signal and to be electrically connected with the variable capacitor. The second circuit is configured to be electrically connected with the first circuit and to change a capacitance of the variable capacitor of the first circuit based on the first signal and the second signal to decrease a phase difference between the first signal and the second signal.

Abstract: An electronic circuit for a micro-electro-mechanical systems gyroscope is disclosed. The electronic circuit includes a current buffer, a transimpedance amplifier coupled with the current buffer, and a plurality of transistors. An inverting input terminal of the current buffer and a non-inverting input terminal of the current buffer are connected with a plurality of first resistors. The inverting input terminal of the current buffer is connected with a source of one of the plurality of transistors, and the non-inverting input terminal of the current buffer is connected with a source of another one of the plurality of transistors. The plurality of first resistors are connected to a ground. The current buffer is configured to isolate a load in the micro-electro-mechanical systems gyroscope from the transimpedance amplifier.

Abstract: The present disclosure provides a varying high voltage source implemented with low voltage domain electronic components that are less costly to manufacture. According to one aspect, the present disclosure provides a high voltage circuit apparatus comprising a pull up resistance module, a plurality of cascode cell stages, a first of the cascode cell stages being coupled to the pull up resistance module, a low voltage domain current sink module coupled to a last of the cascode cell stages, and a clamping voltage source coupled to the last of the cascode cell stages. The circuit apparatus is devoid of high-voltage transistor components.